I'm trying to move away from iCloud completely and apple devices. So first step was to ditch the iPhone. I have an up ad I want to swap for an android device and I will probably keep the mac book for the wife
I replaced my daily driver phone from an iPhone to a Nexus 4 (Nice phone but I'm going back to iOS later this year). The lack of iCloud syncing is a killer because everywhere else I'm using Apple devices. Dropbox is great for access files stored on, say my IMac on my Nexus 4 but despite being broken in places (and if you're a developer and don't cry when the words Core Data are said, then you are very special) iCloud really is the glue that keeps Apple devices so well in sync.
I suppose you pays your money and you takes your choice. Like I said in a post above I'd probably be wanting to roll my own cloud/backup that has encryption I can trust. However even that's a problem as legally you'd have to hand over your encryption keys anyway. Unless you use steganograpgy on the files you don't want anybody to access.
Encryption + steganograpgy plus DropBox should be secure enough for most people.
Oh and don't forget local backup is important too. Restoring from the cloud could be painful.